react-native-stockfish-jsi

Native Stockfish chess engine for React Native using JSI (JavaScript Interface).

Features

• Instant initialization (<100ms vs 15-20s for browser)
• Multi-threaded search (up to 8 cores)
• Full NNUE evaluation (GM-level strength)
• Zero JS bridge overhead (JSI direct calls)
• iOS & Android support

Installation

This is a native module. You must use a custom dev client:

# From workspace root
pnpm install

# iOS
cd ios && pod install && cd ..
npx expo run:ios

# Android  
npx expo run:android

Usage

import { NativeStockfish } from 'react-native-stockfish-jsi';

const engine = new NativeStockfish();
await engine.init({ threads: 4, hashMB: 128, skill: 20 });

engine.onMessage((line) => {
  console.log('UCI:', line);
});

engine.send('uci');
engine.send('isready');
engine.send('position startpos');
engine.send('go depth 15');

// Cleanup
engine.dispose();

Build Requirements

iOS

• Xcode 14+
• CocoaPods
• C++17 compiler

Android

• NDK r25+
• CMake 3.18+
• Gradle 8+

License

MIT